What the site knows that is not markup: where it lives, what the demo cat does, and how a byte range is answered. Pure, so cargo test covers it without a Worker. The link preview's tags are jev_ui::preview; jev is what the page says about where Jev is used, built from the guard's own definitions.

6pub mod config;
7pub mod demo;
8pub mod host;
9pub mod jev;
10pub mod range;